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<p>&#x8FD9;&#x51E0;&#x6B65;&#x64CD;&#x4F5C;&#x6709;&#x65F6;&#x53C8;&#x88AB;&#x79F0;&#x4E3A;&#x8C03;&#x7528;&#x5E8F;&#x5217;&#xFF08;calling sequence&#xFF09;</p>
</blockquote>
<p>&#x4E0A;&#x9762;&#x51E0;&#x6B65;&#x90FD;&#x9700;&#x8981;&#x6211;&#x4EEC;&#x786E;&#x5B9A; <strong>&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#xFF08;calling convention&#xFF09;</strong>&#xFF1A;</p>
<ol>
<li>&#xFF08;&#x7B2C; 1.&#x3001;5. &#x6B65;&#xFF09;&#x53C2;&#x6570;&#x548C;&#x8FD4;&#x56DE;&#x503C;&#x90FD;&#x5982;&#x4F55;&#x51C6;&#x5907;&#x3001;&#x8BE5;&#x653E;&#x54EA;&#x513F;&#xFF1F;</li>
<li>&#xFF08;&#x7B2C; 2.&#x3001;4. &#x6B65;&#xFF09;&#x54EA;&#x4E9B;&#x5BC4;&#x5B58;&#x5668;&#x662F; caller-save &#x7684;&#xFF1F;</li>
<li>&#xFF08;&#x5728; prologue/epilogue &#x4E2D;&#xFF09;&#x90A3;&#x4E9B;&#x5BC4;&#x5B58;&#x5668;&#x662F; callee-save &#x7684;&#xFF1F;</li>
</ol>
<p>&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#x901A;&#x5E38;&#x662F;&#x5728;&#x6C47;&#x7F16;&#x5C42;&#x7EA7;&#x7528;&#x5230;&#x7684;&#xFF0C;&#x6C47;&#x7F16;&#x8BED;&#x8A00;&#x8BFE;&#x4E0A;&#x4E5F;&#x8BB2;&#x8FC7;&#x3002;
&#x56E0;&#x4E3A;&#x6C47;&#x7F16;&#x8BED;&#x8A00;&#x5F88;&#x5E95;&#x5C42;&#xFF0C;&#x6CA1;&#x6709;&#x51FD;&#x6570;/&#x53C2;&#x6570;&#x7684;&#x8BED;&#x8A00;&#x652F;&#x6301;&#xFF0C;&#x53EA;&#x6709;&#x6807;&#x53F7;/&#x5730;&#x5740;/&#x5BC4;&#x5B58;&#x5668;&#xFF0C;&#x6240;&#x4EE5;&#x9700;&#x8981;&#x89C4;&#x5B9A;&#x5982;&#x4F55;&#x7528;&#x6C47;&#x7F16;&#x7684;&#x8BED;&#x8A00;&#x673A;&#x5236;&#x6A21;&#x62DF;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x3002;
&#x6211;&#x4EEC;&#x4E3A;&#x4E86;&#x7B80;&#x5355;&#xFF0C;IR &#x4E0D;&#x63D0;&#x4F9B;&#x5BF9;&#x51FD;&#x6570;&#x7684;&#x8BED;&#x8A00;&#x652F;&#x6301;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x540C;&#x6837;&#x9700;&#x8981;&#x6709; IR &#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#x3002;</p>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#x53EA;&#x662F;&#x4E00;&#x79CD;&#x7EA6;&#x5B9A;&#xFF0C;&#x5B83;&#x4E0D;&#x552F;&#x4E00;&#x3002;</p>
<blockquote>
<p>x86 &#x4E0A;&#x5E38;&#x89C1;&#x7684;&#x5C31;&#x6709;&#x9ED8;&#x8BA4;&#x7684; cdecl&#xFF08;&#x6C47;&#x7F16;&#x8BFE;&#x8BB2;&#x8FC7;&#xFF09;&#x3001;stdcall&#x3001;fastcall &#x7B49;&#x597D;&#x51E0;&#x79CD;&#x3002;</p>
</blockquote>
<p>&#x53EA;&#x8981; caller &#x548C; callee &#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#x76F8;&#x540C;&#xFF0C;&#x90A3;&#x4E48;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x5C31;&#x4E0D;&#x4F1A;&#x51FA;&#x95EE;&#x9898;&#x3002;</p>
<h2 id="risc-v-&#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;">RISC-V &#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;</h2>
<p>32 &#x4F4D; RISC-V &#x7684;&#x6807;&#x51C6;&#xFF08;&#x6307; gcc &#x4F7F;&#x7528;&#x7684;&#xFF09;&#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#x4E2D;&#xFF0C;&#x548C;&#x6211;&#x4EEC;&#x76F8;&#x5173;&#x7684;&#x662F;&#xFF1A;</p>
<ol>
<li>caller-save &#x548C; callee-save &#x5BC4;&#x5B58;&#x5668;&#x5728; <a href="../lab0/riscv.html">&quot;Unprivileged Spec&quot;</a> &#x7684; 109 &#x9875;&#x3002;</li>
<li>&#x8FD4;&#x56DE;&#x503C;&#xFF08;32 &#x4F4D; int&#xFF09;&#x653E;&#x5728; <code>a0</code> &#x5BC4;&#x5B58;&#x5668;&#x4E2D;</li>
<li>&#x53C2;&#x6570;&#xFF08;32 &#x4F4D; int&#xFF09;&#x4ECE;&#x5DE6;&#x5230;&#x53F3;&#x653E;&#x5728; <code>a0</code>&#x3001;<code>a1</code>&#x2026;&#x2026;<code>a7</code> &#x4E2D;&#x3002;&#x5982;&#x679C;&#x8FD8;&#x6709;&#xFF0C;&#x5219;&#x4ECE;&#x53F3;&#x5F80;&#x5DE6;&#x538B;&#x6808;&#xFF0C;&#x7B2C; 9 &#x4E2A;&#x53C2;&#x6570;&#x5728;&#x6808;&#x9876;&#x3002;</li>
</ol>
<blockquote>
<p>&#x81EA;&#x5DF1;&#x4F7F;&#x7528; gcc &#x7F16;&#x8BD1;&#x4E00;&#x4E2A;&#x6709;&#x5F88;&#x591A;&#x53C2;&#x6570;&#x7684;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x5373;&#x53EF;&#x9A8C;&#x8BC1;&#x3002;</p>
</blockquote>
<p>&#x4E3A;&#x4E86;&#x7B80;&#x4FBF;&#x548C;&#x65B9;&#x4FBF;&#x63CF;&#x8FF0;&#xFF0C;&#x6211;&#x4EEC;&#x4E0B;&#x9762;&#x4F7F;&#x7528;&#x4E00;&#x79CD;&#x975E;&#x6807;&#x51C6;&#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#x3002;</p>
<ol>
<li>callee &#x53EA;&#x9700;&#x8981;&#x4FDD;&#x5B58; <code>fp</code> &#x548C; <code>ra</code>&#xFF0C;caller &#x65E0;&#x987B;&#x4FDD;&#x5B58;&#x5BC4;&#x5B58;&#x5668;</li>
<li>callee &#x628A;&#x8FD4;&#x56DE;&#x503C;&#x653E;&#x5728; <code>a0</code> &#x4E2D;&#xFF0C;caller &#x770B;&#x5230;&#x8FD4;&#x56DE;&#x4E4B;&#x540E;&#x628A;&#x8FD4;&#x56DE;&#x503C;&#x538B;&#x5165;&#x8FD0;&#x7B97;&#x6808;</li>
<li>&#x53C2;&#x6570;&#x4E0D;&#x7528;&#x5BC4;&#x5B58;&#x5668;&#x4F20;&#x9012;&#xFF0C;&#x6240;&#x6709;&#x53C2;&#x6570;&#x4ECE;&#x53F3;&#x5F80;&#x5DE6;&#x538B;&#x6808;&#xFF0C;&#x7B2C; 1 &#x4E2A;&#x53C2;&#x6570;&#x5728;&#x6808;&#x9876;&#x3002;</li>
</ol>
<blockquote>
<p>&#x8FD9;&#x4E2A;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#x7684;&#x4F18;&#x70B9;&#x662F;&#x53D9;&#x8FF0;&#x548C;&#x5B9E;&#x73B0;&#x7B80;&#x5355;&#xFF0C;&#x4F46;&#x4E0D;&#x6807;&#x51C6;&#x3002;
&#x4F60;&#x5F53;&#x7136;&#x53EF;&#x4EE5;&#x9009;&#x62E9;&#x5B9E;&#x73B0;&#x6807;&#x51C6;&#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#xFF0C;&#x8FD9;&#x6837;&#x4F60;&#x7684;&#x6C47;&#x7F16;&#x80FD;&#x591F;&#x548C; gcc &#x7684;&#x6C47;&#x7F16;&#x4E92;&#x76F8;&#x8C03;&#x7528;&#x3002;</p>
</blockquote>
<p>&#x91C7;&#x7528;&#x8FD9;&#x4E2A;&#x975E;&#x6807;&#x51C6;&#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;&#xFF0C;&#x4EFF;&#x7167; step5 &#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x753B;&#x51FA;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x8FC7;&#x7A0B;&#x4E2D;&#x6808;&#x5E27;&#x7684;&#x53D8;&#x5316;&#x56FE;&#x3002;
&#x53EF;&#x89C1;&#x73B0;&#x5728;&#x6808;&#x5E27;&#x5305;&#x542B;&#x56DB;&#x5757;&#xFF0C;&#x4ECE;&#x9876;&#x5411;&#x4E0B;&#x4F9D;&#x6B21;&#x662F;&#x8FD0;&#x7B97;&#x6808;&#x3001;&#x5B9E;&#x53C2;&#x3001;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x3001;<code>fp</code> &#x548C; <code>ra</code>&#xFF08;&#x4E0B;&#x56FE; 1.&#xFF09;&#x3002;</p>
<p><img src="pics/param.svg" alt=""></p>
<p>&#x5176;&#x4E2D;&#x8FD8;&#x6709;&#x4E00;&#x4E2A;&#x95EE;&#x9898;&#x5C31;&#x662F;&#x5F62;&#x53C2;&#x7684;&#x5904;&#x7406;&#xFF0C;&#x4F8B;&#x5982;&#x4E0A;&#x9762; 3. &#x5230; 4. &#x8FC7;&#x7A0B;&#x4E2D;&#xFF0C;<code>bar</code> &#x8981;&#x8BBF;&#x95EE; <code>a</code>&#xFF0C;&#x90A3; <code>a</code> &#x653E;&#x5728;&#x54EA;&#x513F;&#xFF1F;
&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x4F7F;&#x7528; <code>foo</code> &#x6808;&#x5E27;&#x4E0A;&#x7684;&#x5B9E;&#x53C2;&#xFF0C;&#x90A3;&#x4E48; <code>a</code> &#x76F8;&#x5BF9; <code>fp</code> &#x7684;&#x504F;&#x79FB;&#x91CF;&#x4E3A; 0&#xFF0C;&#x540C;&#x7406; <code>b</code> &#x504F;&#x79FB;&#x91CF;&#x4E3A; 4&#x3002;
&#x56E0;&#x6B64; step7 &#x4E2D;&#x7684;&#x504F;&#x79FB;&#x91CF;&#x8BA1;&#x7B97;&#x65B9;&#x6CD5;&#x4EC5;&#x9650;&#x975E;&#x53C2;&#x6570;&#x7684;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#xFF0C;&#x800C;&#x7B2C; <code>k&gt;=0</code> &#x4E2A;&#x53C2;&#x6570;&#x76F8;&#x5BF9;&#x4E8E; <code>fp</code> &#x7684;&#x504F;&#x79FB;&#x91CF;&#x662F; <code>4*k</code>&#x3002;</p>
<blockquote>
<p>&#x8FD8;&#x6709;&#x4E00;&#x79CD;&#x65B9;&#x6CD5;&#x662F;&#x628A;&#x53C2;&#x6570;&#x5F53;&#x6210;&#x666E;&#x901A;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#xFF0C;&#x5728; prologue &#x4E2D;&#x590D;&#x5236;&#x5230;&#x6808;&#x5E27;&#x4E2D;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x7684;&#x533A;&#x57DF;&#x3002;</p>
</blockquote>
<h2 id="ir-&#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;">IR &#x7684;&#x8C03;&#x7528;&#x7EA6;&#x5B9A;</h2>
<p>&#x5BF9;&#x4E8E; IR &#x7C7B;&#x4F3C;&#x4E0A;&#x9762;&#x7B80;&#x4FBF;&#x7684;&#x7EA6;&#x5B9A;&#xFF1A;</p>
<ol>
<li>&#x4F20;&#x53C2;&#x4ECE;&#x53F3;&#x5230;&#x5DE6;&#x538B;&#x6808;</li>
<li>&#x8FD4;&#x56DE;&#x503C;&#x653E;&#x5728;&#x6808;&#x9876;</li>
</ol>
<p>&#x53E6;&#x5916;&#xFF0C;IR &#x4E5F;&#x9700;&#x8981;&#x4FDD;&#x5B58;&#x8FD4;&#x56DE;&#x5730;&#x5740;&#xFF0C;&#x5982;&#x679C;&#x5B83;&#x8981;&#x4F5C;&#x4E3A;&#x4E00;&#x95E8;&#x72EC;&#x7ACB;&#x7684;&#x8BED;&#x8A00;&#xFF0C;&#x9700;&#x8981;&#x88AB;&#x6267;&#x884C;&#x7684;&#x8BDD;&#x3002;
&#x4F46;&#x6211;&#x4EEC;&#x6682;&#x65F6;&#x6CA1;&#x6709;&#x8FD9;&#x4E2A;&#x9700;&#x6C42;&#xFF0C;&#x53EF;&#x4EE5;&#x4E0D;&#x7BA1;&#x5B83;&#x3002;&#x53EF;&#x4EE5;&#x5047;&#x8BBE; call &#x6307;&#x4EE4;&#x4F1A;&#x628A;&#x8FD4;&#x56DE;&#x5730;&#x5740;&#x4FDD;&#x5B58;&#x5230;&#x5176;&#x4ED6;&#x5730;&#x65B9;&#xFF0C;&#x5E76;&#x4E14;&#x540C;&#x65F6;&#x628A;&#x5F53;&#x524D;&#x6808;&#x5E27;&#x8BBE;&#x4E3A;&#x65B0;&#x51FD;&#x6570;&#x7684;&#x3002;</p>
<blockquote>
<p>&#x6C47;&#x7F16;&#x7684; <code>call</code>&#xFF08;&#x5C31;&#x662F; <code>jalr</code>&#xFF09;&#x4F1A;&#x4FDD;&#x5B58;&#x8FD4;&#x56DE;&#x5730;&#x5740;&#x5230; <code>ra</code>&#xFF0C;&#x7136;&#x540E; prologue &#x91CC;&#x4F1A;&#x4FDD;&#x5B58; <code>ra</code> &#x5230; callee &#x6808;&#x5E27;&#x4E2D;&#x3002;</p>
</blockquote>

                                
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